Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
In a high-magnetic field experiment, a conducting bar carrying a 75 kA passes through a 30-cm long region containing a 22-T magnetic field. If the bar makes a 60 degree angle with the field direction what force is necessary to hold it in its place.
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
Three circular loops of wires of radius R,2R,3R respectively are made into concentric circles. A clockwise current of 3A exists in the innermost and outermost loops. Determine the magnitude and dirrction in the middle loop if the net field at the center is zero.
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
You have a spool of thin wire that can handle a maximum current of 0.5 A.If you could wind the wire into a loop- like coil 20 cm in diameter, how many turns should the coil have if the magnetic field at its center is to be 2.3 mT at the maximum current.
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
In a certin region, the average radius of curvature of the trajectory of electrons in the Van Allen belt is 300 m and the average electron energy is 100 ke V.What is the value of the earth,s magnetic field in this region?
Physics Heat & Thermodynamics Level: Misc Level
A Carnot refrigeration is used to make 1 kg of ice at-10 C from 1 kg of water at 20 C, which is also the temperature of the kitchen. How many joules of work must be done?
Physics Heat & Thermodynamics Level: Misc Level
Three designs for a heat engine to operate between 450 K and 300 K are proposed.Design A is claimed to require a heat input of 2 kJ for each kJ of work output, design B a heat input of 3 kJ, and design C a heat input of 4 kJ. Which design would you choose and why?
Physics Heat & Thermodynamics Level: Misc Level
A gas expands by 1 L at a constant pressure of 2 bars. During the expansion 500 J of heat is added. Find the change in the internal energy of the gas.
Physics Electrostatics Level: Misc Level
An automatic external defibrillator delivers 125 J of energy at a voltage of 1050 V. What is the capacitance of this device.
Physics Electrostatics Level: Misc Level
A parallel plate capacitor has plates of an area of area.0066 m squared and a separation of.45 mm. (a)Find the magnitude of the charge on each plate when the capacitor is connected to a 12-V battery. (b) will your answer to part (a) increase ,decrease,or stay the same if the separation between the plates is increased. explain.(c) calculate the magnitude of the charge on the plates if the separation is .90 mm.
Physics Electrostatics Level: Misc Level
Consider a region in space where where a uniform electric field E=7500 n/c points in the negative x direction. (a) what is the orientaion of the equipotential surfaces. (b) if you move in the positive x direction, does the electric potential increase or decreas. explain.(c) what is the distance between the +14-v and the +16-v equipotenentials.
Physics Electrostatics Level: Misc Level
A square of a side a has charges+Q at each corner. What is the electric potential energy of this system of charges.
Physics Electrostatics Level: Misc Level
Point charges +4.1 uC and -2.2 uC are placed on the x axis at (11 m,0) and (-11,0), respectively. (a) Sketch the electric potential on the x axis for this system. (b) your sketch should show on epoint on the x axis between the two charges where the potential vanishes.In the point closer to the +4.1 uC charge or closer to the -2.2 uC. explain. (c) find the point refered to in part b
Physics Wave Optics Level: Misc Level
Coherent light from a laser is split into two beams with intensities I0 and 4I0,respectively.What is the intensity of the light when the beams are recombined?If there is more than one possibility, give the range of possibilities.
Physics Ray Optics Level: Misc Level
The objective lens of an astronomical telescope forms an image of a distant object at the focal point of the eyepiece, which has a focal length of 5.0 cm.If the two lenses are 45.0 cm apart, what is the angular magnification?
Physics Ray Optics Level: Misc Level
Keesha is looking at a beetle with a magnifying glass.She wants to see an upright, enlarged image at a distance of 25 cm.The focal legth of the magnifying glass is +5.0 cm .Assume that Keesha,s eye is close to magnifying glass.(a)What should be the distance between the magnifying glass and the beetly?(b)What is the angular magnification?
